If the credit card under the Client account expires, Overture’s system will automatically go to the Agency account and use the first credit card listed in the Agency account regardless of if it is the credit card that belongs to that client or not. The change in credit card happens without any notification to either the customer or the agency.

The thread creator came up with a solution for this not to happen again. He said just to change the credit card of choice, in the pull down, to "Choose Credit Card".